Ceru it is =D
Which is fitting. Because in english, if you say "Ceru" with a hard "K" sound, it sounds simliar to Kiru, which is japanese for "to cut / slice".
Fitting
Or Ceru as in "Seru / DE: Zeru", IDK it just sounds cool.
Or could go by Lean. As in a Lean MF killin' machine